Front left low beam out... Not bulb!
#1
Junior Member
Thread Starter
Front left low beam out... Not bulb!
I have relentlessly scoured the forums for an answer but have yet to find one. The low beam on my 2001 S430 is out and to my surprise it was not the bulb (oh Mercedes...). I replaced the front right SAM module because I had read that it may have been the cause but it was not. So now I'm still stuck without a headlight and hoping I dont get pulled over.. any help appreciated
#2
Usually the ballast or wiring of its not the bulb
Many people buy an aftermarket hid kit which plugs into the working factory harness and included new wiring to run to both hid lights
Many people buy an aftermarket hid kit which plugs into the working factory harness and included new wiring to run to both hid lights
#3
Junior Member
Thread Starter
Thanks for the info. If that is the case, is there any way to test the ballast? Should I replace the whole headlight unit?
If I was to do that I would put these in.. let me know what you think. http://www.specdtuning.com/dec-14-lhp-bw22000-tm.html
Ive never been one to do aftermarket upgrades but these look pretty cool without being too tacky.
If I was to do that I would put these in.. let me know what you think. http://www.specdtuning.com/dec-14-lhp-bw22000-tm.html
Ive never been one to do aftermarket upgrades but these look pretty cool without being too tacky.
#4
Junior Member
Thread Starter
I have relentlessly scoured the forums for an answer but have yet to find one. The low beam on my 2001 S430 is out and to my surprise it was not the bulb (oh Mercedes...). I replaced the front right SAM module because I had read that it may have been the cause but it was not. So now I'm still stuck without a headlight and hoping I dont get pulled over.. any help appreciated
#5
MBWorld Fanatic!
how was it you determined that the bulb is good?
have you checked to ensure that the contacts on the bulb and socket are not corroded?
another method would be to swap low beam bulbs left to right headlights to see
if the problem follows the swap.
in any case, have you utilized a volt meter to check for voltage in the socket?
if not, do, as it would be an important indicator whether there is any power there.
did you check the appropriate fuse and have verified that it is intact (don't just
look at it, but perform a continuity check)?
have you checked to ensure that the contacts on the bulb and socket are not corroded?
another method would be to swap low beam bulbs left to right headlights to see
if the problem follows the swap.
in any case, have you utilized a volt meter to check for voltage in the socket?
if not, do, as it would be an important indicator whether there is any power there.
did you check the appropriate fuse and have verified that it is intact (don't just
look at it, but perform a continuity check)?
#6
Super Member
Originally Posted by Gordon Cooke
If that is the case, is there any way to test the ballast?
A new headlight unit won't help if there is no juice.
#7
Super Member
Sorry, need a 12V voltage tester such as this one: http://mobiledistributorsupply.com/c...Rg7BoCZpjw_wcB
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#8
Junior Member
Thread Starter
how was it you determined that the bulb is good?
have you checked to ensure that the contacts on the bulb and socket are not corroded?
another method would be to swap low beam bulbs left to right headlights to see
if the problem follows the swap.
in any case, have you utilized a volt meter to check for voltage in the socket?
if not, do, as it would be an important indicator whether there is any power there.
did you check the appropriate fuse and have verified that it is intact (don't just
look at it, but perform a continuity check)?
have you checked to ensure that the contacts on the bulb and socket are not corroded?
another method would be to swap low beam bulbs left to right headlights to see
if the problem follows the swap.
in any case, have you utilized a volt meter to check for voltage in the socket?
if not, do, as it would be an important indicator whether there is any power there.
did you check the appropriate fuse and have verified that it is intact (don't just
look at it, but perform a continuity check)?
My second guess was the fuse but apparently there isn't a regular fuse but rather an electronic fuse that I don't have access to (someone correct me if I'm wrong on that)
I didn't check for voltage in the socket because I just assumed I wasn't getting any because it wasn't lighting a new bulb. It will be easy enough for me to check though.
#9
Junior Member
Thread Starter
Sorry, need a 12V voltage tester such as this one: http://mobiledistributorsupply.com/c...Rg7BoCZpjw_wcB
#10
Super Member
If you get some juice there then those bulb contacts need to be cleaned. If not you will need to go back to your electronic fuses as you don't have the ballads.
#11
Junior Member
Thread Starter
My issue is my lack of understanding of where these "fuses" are and how to replace or check them. I'm only familiar with standard fused you can pop out. I was unable to find a location for this electronic fuse and I'm not sure if an electronic fuse can break or be replaced.
#12
Super Member
Here is my understanding of the electronic fuse:
The electronic fuses in the W220 S Class have no serviceable parts. The "fuses" which are actually transistorized circuits that detect overload condition and switch off automatically, have property of self-resetting when the overload condition is gone.
The SAM was replaced so it's likely that the receiver still has short circuit/open circuit condition. (I assumed the 2nd SAM is good)
The electronic fuses in the W220 S Class have no serviceable parts. The "fuses" which are actually transistorized circuits that detect overload condition and switch off automatically, have property of self-resetting when the overload condition is gone.
The SAM was replaced so it's likely that the receiver still has short circuit/open circuit condition. (I assumed the 2nd SAM is good)
#13
Ok you have halogen lights - so you have no ballasts
Again the cheapest way to fix this is , simply to buy an aftermarket hid kit , they plug in to your single working halogen wiring (to control on/off) and they include all new wiring for both new hid lights. This bypasses the fusible links and problems with your current wiring
You want a canbus h7 hid kit , these cost $60-80 on Amazon
Yes you can upgrade to the spec D lights also .
Again the cheapest way to fix this is , simply to buy an aftermarket hid kit , they plug in to your single working halogen wiring (to control on/off) and they include all new wiring for both new hid lights. This bypasses the fusible links and problems with your current wiring
You want a canbus h7 hid kit , these cost $60-80 on Amazon
Yes you can upgrade to the spec D lights also .
Last edited by tusabes; 07-19-2016 at 06:58 PM.
#14
SPONSOR/MBworld Guru
If you're looking for a higher end kit, we carry plug and play Morimoto HID conversion kits.
#15
Junior Member
Thread Starter
Ok you have halogen lights - so you have no ballasts
Again the cheapest way to fix this is , simply to buy an aftermarket hid kit , they plug in to your single working halogen wiring (to control on/off) and they include all new wiring for both new hid lights. This bypasses the fusible links and problems with your current wiring
You want a canbus h7 hid kit , these cost $60-80 on Amazon
Yes you can upgrade to the spec D lights also .
Again the cheapest way to fix this is , simply to buy an aftermarket hid kit , they plug in to your single working halogen wiring (to control on/off) and they include all new wiring for both new hid lights. This bypasses the fusible links and problems with your current wiring
You want a canbus h7 hid kit , these cost $60-80 on Amazon
Yes you can upgrade to the spec D lights also .
#16
Don't buy the new style headlights yet
Just buy the hid conversion kit
(you will need to use the kit with those new lights anyway, unless you want ugly yellow halogen lights in there )
Just buy the hid conversion kit
(you will need to use the kit with those new lights anyway, unless you want ugly yellow halogen lights in there )
The following users liked this post:
Gordon Cooke (07-20-2016)
#17
Junior Member
Thread Starter
#18
MBWorld Fanatic!
If you want to fix the halogen lights, you need to check:
- Power at the bulb contact with the lights turned on - voltage from the contact to a good body/chassis/engine ground should be 12vdc or higher.
- Power at the bulb contact with the lights turned on - voltage from the contact to the ground portion of the bulb socket should be 12vdc or higher.
- Continuity from the ground portion of the bulb socket to a good body/chassis/engine ground should be very close to zero Ohms resistance.
- The bulb socket should be clean and bright, with no visual corrosion.
- Power at the bulb contact with the lights turned on - voltage from the contact to a good body/chassis/engine ground should be 12vdc or higher.
- Power at the bulb contact with the lights turned on - voltage from the contact to the ground portion of the bulb socket should be 12vdc or higher.
- Continuity from the ground portion of the bulb socket to a good body/chassis/engine ground should be very close to zero Ohms resistance.
- The bulb socket should be clean and bright, with no visual corrosion.